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NuWatt designs, installs, and manages solar, battery, heat pump, and EV charger systems across 9 states. One company, one warranty, one point of contact.
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SunPower Corporation filed for Chapter 11 bankruptcy on August 5, 2024. The brand and residential business were acquired by Complete Solaria, which has made public commitments to honor existing warranties, but legal enforceability of a 25-year warranty from a company emerging from bankruptcy is limited. NuWatt stopped quoting SunPower panels in 2024. We install REC Alpha Pure-RX 470W — same premium tier, IBC-class cell technology, stable Reliance Industries parent.
If you’re shopping for SunPower in 2026, you’re shopping for a warranty promise that is no longer backed by the original SunPower Corporation. Our recommendation is REC Alpha Pure-RX 470W — same premium segment, backed by Reliance Industries (NYSE: RIGD), $100B+ parent, public since 1973.
SunPower Corporation filed Chapter 11 on August 5, 2024. The residential business was acquired by Complete Solaria (formerly Complete Solar) later that year. Complete Solaria has made public commitments to honor existing SunPower warranties, but legal enforceability of a 25-year warranty from a post-bankruptcy entity is not the same as the original contract.
No new residential installations of legacy SunPower panels are being produced. The X-series products have been discontinued. Any panel sold as “SunPower” in 2026 is from Complete Solaria inventory or a new product line under the acquired brand — not the original manufacturer.
The closest technology match NuWatt installs is the REC Alpha Pure-RX 470W. REC uses HJT cells, which are the same low-degradation, low-temperature-coefficient class as SunPower’s IBC technology. Reliance Industries acquired REC in 2021 and has invested in HJT capacity expansion — the parent-company trajectory is the opposite of SunPower’s.
For customers with existing SunPower installations: document your panel serial numbers, current production output, and any fault codes today. Future warranty claims will need this baseline. We can generate a production audit from your monitoring dashboard if you’re a NuWatt customer.
The Brand Stability Question
Brand Stability
Chapter 11 August 2024, brand acquired by Complete Solaria
Our assessment
SunPower Corporation filed for Chapter 11 bankruptcy protection on August 5, 2024. The SunPower brand and residential business were subsequently acquired by Complete Solaria (formerly Complete Solar). Existing SunPower panel warranties are in uncertain status — Complete Solaria has made public commitments to honor them but legal protection is limited.
Rating current as of 2026-04-09
Federal ITC & Domestic Content Adder
For commercial installs, the panel’s country of manufacture and ownership structure directly determine ITC eligibility and whether you qualify for the 10% domestic content adder. Here’s the honest assessment for SunPower X22-370.
Federal ITC & Domestic Content
Discontinued — FEOC status moot
Details
Pre-bankruptcy SunPower manufactured in Mexico and the Philippines. Not currently in production. Existing panels may qualify depending on acquisition date and ownership chain — consult a tax professional for any project with legacy SunPower hardware.
Informational only, not tax advice. Federal ITC qualification and domestic content adder eligibility depend on project-level analysis by a qualified tax professional.
Do the math yourself
These tools are pre-configured to the SunPower panel you came to this page for. Change the state, roof config, system size, rate growth, and ownership length — then compare against our alternative.
Live calculation — your climate, your roof, your numbers
Summer peak ambient: 84°F · $0.31/kWh
Dark shingles absorb the most heat
Ridge + soffit vents keep panels cooler
Airflow behind panels matters more than people think
Your Heat Penalty
Climate grade: A+39°C
Panel temp at peak
102°F
4.1%
Peak output loss
vs STC rating
114
Annual kWh lost
per 8,000 kWh system
$35
Dollar loss/year
at $0.31/kWh
Heat loss is a minor concern here, and this panel handles it well.
Heat advantage vs baseline panel
Compared to a standard PERC panel at -0.34%/°C temperature coefficient
+20 kWh
more per year
+$6
saved per year
$152
over 25 years
Methodology
peak loss % = (panel temp − 25°C) × |temp coefficient|
STC (Standard Test Conditions) rates panels at 25°C (77°F). Every degree above that costs output at the panel’s temperature coefficient. Baseline -0.34%/°C represents an average PERC panel; HJT panels at -0.24%/°C lose roughly 30% less energy to heat. Annual kWh lost assumes an 8,000 kWh baseline system with 35% of the year spent at elevated summer panel temperatures. Based on NREL System Advisor Model (SAM) methodology for module temperature derating.
Translates marketing percentages into real dollars over ownership
25 years
Default 1,200 kWh/kW is typical for New England residential rooftops
Your guaranteed output over time
0.25%/yr · 92% warranty8,832
Year-25 output
92.0% of new
—
Year-30 (N/A)
Warranty ends year 25
232,936
Lifetime kWh
over 25 years
$0.19
Cost per kWh
installed, warranted
vs baseline panel (0.55%/yr, 80% year-25)
Additional lifetime production
+8,128kWh
Additional lifetime savings
+$4,404
This panel's warranty is worth $4,404 more than a baseline value-tier panel over 25 years.
Output % by year — this panel vs baseline
Calculations use 4% annual utility rate growth compounded year over year. Degradation is applied compounding: each year’s production equals the prior year multiplied by (1 − degradation). Install cost is estimated as price/watt × 2.8× to cover inverter, racking, labor, and permits. The baseline panel assumes 0.55%/year degradation and a 80% year-25 performance warranty — the industry median for value-tier modules. Sources: NREL PV degradation rates study and panel manufacturer datasheets.
NuWatt’s pick
Our premium tier. REC Alpha Pure-RX 470W is the most efficient panel we can reliably deliver with a stable 25-year warranty backing it.
Efficiency
22.6%
Wattage
470W
Temp coefficient
-0.24%/°C
Warranty
25-yr
Free instant estimate. Takes 60 seconds. No pressure.
Frequently Asked
SunPower Corporation (formerly NASDAQ: SPWR) filed for Chapter 11 bankruptcy protection on August 5, 2024. The filing cited liquidity pressure and difficulty servicing debt after the collapse of US residential solar financing markets in 2023–24. The residential solar business and brand were subsequently acquired by Complete Solaria (now Complete Solar Inc.) through the bankruptcy process. The original SunPower Corporation no longer exists as an operating entity.
Complete Solaria has made public commitments to honor existing SunPower panel warranties acquired through the bankruptcy. Whether those commitments are legally enforceable in all cases depends on the specifics of the acquisition and the warranty contract you signed. For practical purposes, we recommend SunPower owners document their panels now (serial numbers, production baseline, photos of monitoring dashboards) to establish a paper trail for any future claim. We can’t guarantee the outcome of a warranty claim against a post-bankruptcy successor entity — that depends on factors outside of NuWatt’s control.
REC Alpha Pure-RX 470W. Both panels are premium-tier with low degradation (0.25%/year), low temperature coefficient (-0.24%/°C for REC, -0.29%/°C for SunPower X22), and a 25-year warranty. The main technology difference is that SunPower used IBC (Interdigitated Back Contact) cells while REC uses HJT (Heterojunction) cells — both are considered premium cell architectures with similar real-world performance. REC has the advantage of being backed by Reliance Industries, a $100B+ parent company.
Complete Solaria (originally Complete Solar) is a US-based residential solar installer and, after acquiring SunPower’s residential business through the bankruptcy process, also a panel brand operator. Complete Solaria is publicly traded (NASDAQ: CSLR). Their position is that the SunPower brand will continue as a product line. Whether that is the same as buying from pre-bankruptcy SunPower is a judgment call — we don’t think it’s the same and we don’t quote SunPower panels to new customers.
No. Existing SunPower installations continue to produce power normally and there is no safety reason to remove them. The concern is warranty enforceability if a panel fails years from now — and that concern is about future claims, not current performance. Our practical advice for SunPower owners: (1) document current production and panel serial numbers now, (2) keep any monitoring subscription active so you have a continuous record, (3) if a panel does fail, contact Complete Solaria first and escalate through your state attorney general’s consumer protection office if warranty service is refused.
Yes. LG Electronics exited the solar panel business entirely in June 2022 — LG NeON R and NeON 2 products have no ongoing manufacturer warranty support. Panasonic discontinued its original HIT product line in 2023, and panels sold today under the "Panasonic EverVolt" brand are produced by a third-party manufacturer under license, not by Panasonic. Meyer Burger (Swiss HJT manufacturer) is in active restructuring as of 2024-25 with factory closures. We track brand stability for every panel in our database — see our /solar-panels page for the full grid.
For commercial solar projects, yes — Section 48/48E remains active through the July 4, 2026 construction deadline. For residential rooftop solar purchased by the homeowner, no — Section 25D (Residential Clean Energy Credit) expired on December 31, 2025 under the OBBBA. State-level programs (SMART 3.0 in MA, Energize CT in CT, NJ Clean Energy, etc.) remain active and are now the primary savings mechanism for residential solar.